大地控制点
- 网络geodetic control point
大地控制点-
山东省地勘测绘数据库系统是对大地控制点成果进行存贮、供应、管理的综合性多用途数据库系统。
The database of surveying and mapping of geological prospecting of Shandong is a synthetic and multipurpose database system for storage , supply and management to geodetic control points .
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通常遥感影像正射纠正需要依赖已知大地坐标的地面控制点（GCP）。
Usually ortho-rectifying RS images require ground control points ( GCP ), of which geodetic coordinates are known . However in the mission of reconnoitering foreign lands , it is very difficult to carry out GCP field survey and it is also not easy to obtain large-scale topographic maps .